阅读说明：本技术 一种轴向柱塞泵柱塞及轴向柱塞泵 (Axial plunger pump plunger and axial plunger pump ) 是由 张莹 周宇 杨广文 焦玲 李跃军 曹明 张丽丽 于 2021-06-21 设计创作，主要内容包括：本发明涉及一种轴向柱塞泵柱塞及轴向柱塞泵,包括柱塞球头(1)和柱塞杆(2),所述柱塞杆(2)的末端设置有轴承(3),通过所述轴承(3)带动所述柱塞杆(2)摆动。根据本发明所提供的柱塞的运用,能有效减小柱塞与泵缸体柱塞孔的摩擦磨损,提高轴向柱塞泵的寿命及效率。(The invention relates to an axial plunger pump plunger and an axial plunger pump, comprising a plunger bulb (1) and a plunger rod (2), wherein the tail end of the plunger rod (2) is provided with a bearing (3), and the plunger rod (2) is driven to swing through the bearing (3). According to the application of the plunger provided by the invention, the friction and abrasion between the plunger and the plunger hole of the pump cylinder body can be effectively reduced, and the service life and the efficiency of the axial plunger pump are improved.)

1. The axial plunger pump plunger comprises a plunger bulb (1) and a plunger rod (2), and is characterized in that a bearing (3) is arranged at the tail end of the plunger rod (2), and the plunger rod (2) is driven to swing through the bearing (3).

2. The axial plunger pump plunger according to claim 1, characterized in that the bearing (3) is a self-lubricating spherical plain bearing, the plunger rod (2) is conical, and the extension of the conical surface of the plunger rod (2) is tangential to the inner spherical surface of the self-lubricating spherical plain bearing.

3. The axial plunger pump plunger according to claim 2, characterized in that the plunger rod (2) is cylindrical, the extension of the cylindrical surface of the plunger rod (2) being tangential to the inner spherical surface of the self-lubricating spherical plain bearing.

4. The axial plunger pump plunger according to claim 1, wherein the bearing (3) is an outer spherical ball bearing, the plunger rod (2) is conical, and the extension of the conical surface of the plunger rod (2) is tangential to the outer spherical surface of the outer spherical ball bearing.

5. The axial plunger pump plunger according to claim 4, characterized in that the plunger rod (2) is cylindrical, the extension of the cylindrical surface of the plunger rod (2) being tangential to the outer spherical surface of the outer spherical ball bearing.

6. The axial plunger pump plunger as recited in claim 1, characterized in that the bearing (3) is a deep groove ball bearing, the plunger rod (2) is cylindrical, and the extension of the cylindrical surface of the plunger rod (2) is tangential to the outer surface of the deep groove ball bearing.

7. Plunger for axial piston pumps according to any of claims 1-6 characterized in that the bearing (3) is provided with a bearing anti-slip mechanism (4) at its end.

8. An axial plunger pump plunger and an axial plunger pump, characterized in that the axial plunger pump plunger as claimed in any one of claims 1 to 7 is comprised.

Technical Field

The invention relates to a hydraulic axial plunger pump plunger, in particular to an axial plunger pump plunger and an axial plunger pump.

Background

The pump is the power element and core element of the pressure system, and therefore has extremely important significance for the design and research thereof. The hydraulic axial plunger pump is mainly composed of a transmission shaft, a shell, a swash plate, a plunger, a cylinder body, a spring, a bearing, a valve plate, a rear cover and the like. The plungers are uniformly distributed in the cylinder body along the circumference and rotate and reciprocate in the plunger holes of the cylinder body, and the key friction loss is caused due to complex stress.

The three pairs of key friction pairs of the common plunger pump structure comprise a plunger and a cylinder hole, a slipper and a swash plate, and a port plate and the end surface of a cylinder body which are in surface contact, so that the sealing effect is relatively good, relatively high volumetric efficiency can be ensured under the working conditions of high pressure ratio and low viscosity medium, and the friction pairs have relatively low PV value compared with vane type and gear type pumps. Therefore, the conventional pump mostly adopts a plunger type structure.

When the axial plunger pump works in practice, as the swash plate or the inclined shaft extrudes the plunger assembly at a certain angle, the radial pressure of the plunger and the cylinder body is larger, the plunger inevitably generates friction loss, and the efficiency and the service life of the axial plunger pump are greatly reduced.

Disclosure of Invention

The invention aims to provide an axial plunger pump plunger and an axial plunger pump, and aims to reduce friction between the plunger and a piston cylinder and prolong the service life of the plunger pump.

The object of the present invention and the technical problem to be solved are achieved by the following technical means.

The invention provides an axial plunger pump plunger, which comprises a plunger ball head (1) and a plunger rod (2), wherein a bearing (3) is arranged at the tail end of the plunger rod (2), so that the bearing (3) drives the plunger rod (2) to swing.

Furthermore, the bearing (3) is a self-lubricating joint bearing, the plunger rod (2) is conical, and the extension line of the conical surface of the plunger rod (2) is tangent to the inner spherical surface of the self-lubricating joint bearing.

Further, the plunger rod (2) is cylindrical, and the extension line of the cylindrical surface of the plunger rod (2) is tangent to the inner spherical surface of the self-lubricating joint bearing.

Furthermore, the bearing (3) is an outer spherical ball bearing, the plunger rod (2) is conical, and the extension line of the conical surface of the plunger rod (2) is tangent to the outer spherical surface of the outer spherical ball bearing.

Furthermore, the plunger rod (2) is cylindrical, and the extension line of the cylindrical surface of the plunger rod (2) is tangent to the outer spherical surface of the outer spherical surface ball bearing.

Furthermore, the bearing (3) is a deep groove ball bearing, the plunger rod (2) is cylindrical, and the extension line of the cylindrical surface of the plunger rod (2) is tangent to the outer surface of the deep groove ball bearing.

Furthermore, a bearing anti-falling mechanism (4) is arranged at the tail end of the bearing (3).

In a second aspect the invention provides an axial piston pump comprising an axial piston pump piston as described above.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic cross-sectional view of an axial piston pump in accordance with an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a plunger employing a self-lubricating spherical plain bearing according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a plunger utilizing an outer spherical ball bearing in accordance with an embodiment of the present invention;

fig. 4 is a schematic cross-sectional view of a plunger using a self-deep groove ball bearing according to an embodiment of the present invention.

Reference numerals:

1: plunger bulb 2: plunger rod

3: a bearing; 4: bearing anti-falling mechanism

5: plunger 6: sliding boot

Detailed Description

In order to make the description of the present invention more complete and complete, reference is made to the accompanying drawings and the various embodiments described below, in which like reference numerals refer to the same or similar elements. In other instances, well-known elements and steps have not been described in detail in order to avoid unnecessarily obscuring the present invention.

Please refer to fig. 1 to 4; fig. 2 is a schematic cross-sectional view of a plunger using a self-lubricating spherical plain bearing according to an embodiment of the present invention;

the plunger provided by the embodiment comprises a plunger ball head (1), a plunger rod (2) and a bearing (3) arranged at the tail end of the plunger rod (2). In the embodiment, the bearing (3) is a self-lubricating spherical joint bearing, the plunger rod (2) can be in a conical structure or a cylindrical structure, when the plunger rod is conical, the extension line of the conical surface of the plunger rod (2) is tangent to the inner spherical surface of the self-lubricating spherical joint bearing, and when the plunger rod is cylindrical, the extension line of the cylindrical surface of the plunger rod (2) is tangent to the inner spherical surface of the self-lubricating spherical joint bearing.

By the structure, the plunger can be driven by the inner ring of the outer spherical surface of the self-lubricating joint bearing to swing at any angle. When the plunger works, the stress between the plunger rod and the wall of the piston cylinder can be reduced through the arranged bearing in the processes of high-speed rotation and piston movement of the plunger, so that the friction pair is reduced, the friction loss between the plunger and the piston cylinder is reduced, and the service life of the plunger pump is prolonged.

Particularly, for the conical plunger of the inclined shaft type axial plunger pump, the bearing is arranged at the tail part of the plunger or the bearing replaces the original piston ring, compared with the prior structure or the piston ring, the bearing has high precision and high strength, not only can increase the sealing area, but also can reduce the deformation, thereby reducing the friction and the abrasion; for a straight shaft plunger of the through shaft type axial plunger pump, the bearing precision is high, and the abrasion can be reduced.

Fig. 3 is a schematic cross-sectional structural view of a plunger using an outer spherical ball bearing according to an embodiment of the present invention; in the embodiment, the bearing (3) is an outer spherical ball bearing, the plunger rod (2) can be in a conical structure or a cylindrical structure, and when the plunger rod is conical, the extension line of the conical surface of the plunger rod (2) is tangent to the outer spherical surface of the outer spherical ball bearing; when the plunger rod is cylindrical, the extension line of the cylindrical surface of the plunger rod (2) is tangent to the outer surface of the spherical outer ball bearing.

In the embodiment, the outer spherical ball bearing is adopted, so that when the plunger works, the friction loss between the plunger and the wall of the piston cylinder in the process of high-speed rotation of the plunger can be reduced; meanwhile, the spherical outer spherical surface shaft is generally double-layer sealed, has better sealing performance and can effectively prevent hydraulic oil from leaking, so the scheme of the embodiment has the advantages of reducing the friction loss of the plunger and preventing the hydraulic oil from leaking.

FIG. 4 is a schematic cross-sectional view of a plunger using a self-deep groove ball bearing according to an embodiment of the present invention; in the embodiment, the bearing (3) is a deep groove ball bearing, the corresponding plunger rod (2) is cylindrical, and the extension line of the cylindrical surface of the plunger rod (2) is tangent to the outer surface of the deep groove ball bearing.

In the embodiment, the deep groove ball bearing is adopted, so that when the plunger works, the friction loss between the plunger and the wall of the piston cylinder in the high-speed rotation process of the plunger can be reduced; in the present embodiment, an oil-proof (contact oil seal) deep groove ball bearing is adopted as a preferred embodiment.

In the above embodiment, a bearing anti-falling mechanism (4) may be further provided at the tail of the bearing (3) for preventing the bearing from falling off and shifting, and the anti-falling mechanism may be a collar, a positioning bolt, or the like.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.